Quiz 1

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Quiz_1_2009 (902862)
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1. Question Details[1158062]

A block slides across a rough horizontal table top. The work done by friction changes:
only the kinetic energy
only the internal energy
only the kinetic and potential energies
only the potential energy
only the kinetic and internal energies


Which of the five graphs correctly shows the potential energy of a spring as a function of its elongation x?

II
IV
III
I
V


A simple pendulum consists of a 2.0 kg mass attached to a string. It is released from rest at X as shown. Its speed at the lowest
point Y is:

3.6 m/s

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36 m/s
0.90 m/s
6.0 m/s


A man pulls a sled along a rough horizontal surface by applying a constant force F at an angle θ above the horizontal. In pulling
the sled a horizontal distance d, the work done by the man is:
Fd
Fd/cos θ
Fd/sin θ
Fd cos θ
Fd sin θ


A giant wheel, 40 m in diameter, is fitted with a cage and platform on which a man can stand. The wheel rotates at such a speed
that when the cage is at X (as shown) the force exerted by the man on the platform is equal to his weight. The speed of the man
(in m/s) is:

14
120
80
28
20


2
A man weighing 700 N is in an elevator that is accelerating upward at 4 m/s . The force exerted on him by the elevator floor is:
290 N
700 N
990 N
71 N
410 N


A 25 kg chair is pushed across a frictionless horizontal floor with a force of 200 N, directed 20° below the horizontal. The
magnitude of the normal force of the floor on the chair is:
25 N
250 N
310 N
68 N

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180 N


An object is shot from the back of a truck moving at 30 mph on a straight horizontal road. The launcher is aimed upward,
perpendicular to the bed of the truck. The object falls:
on the truck
behind the truck
depends on the initial speed of the object
depends on the value of g
in front of the truck


The airplane shown is in level flight at an altitude of 0.50 km and a speed of 150 km/h. At what distance d should it release a
2
heavy bomb to hit the target X? Take g = 10 m/s .

150 m
417 m
15,000 m
295 m
2550 m


Which of the following is NOT an example of accelerated motion?
A swinging pendulum
Earth's motion about sun
Circular motion at constant speed
Horizontal component of projectile motion
Vertical component of projectile motion


Use the definition of scalar product, a·b = ab cos θ, and the fact that a·b = a b + a b + a b to calculate the angle between the
x x y y z z
two vectors given by a = 1.0 i + 5.0 j + 3.0 k and b = 5.0 i + 3.0 j + 6.0 k.
°


2
An object is thrown vertically upward with a certain initial velocity in a world where the acceleration due to gravity is 19.6 m/s .
The height to which it rises is ____ that to which the object would rise if thrown upward with the same initial velocity on the

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Earth. Neglect friction.
half
four times

twice
cannot be calculated from the given data


At a stop light, a truck traveling at 15 m/s passes a car as it starts from rest. The truck travels at constant velocity and the car
2
accelerates at 3 m/s . How many seconds will it take for the car to catch up to the truck?
15
10
20
25
5

Assignment Details

4 of 4 7/13/09 3:41 PM

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